May 2019 1 28 Report
Tentukan jumlah proton dan neutron pada atom
a.Helium<2He⁴>=>z=2,A=4
b.Natrium<⁴Na²>=>z=11,A=23
c.Karbon <6C¹²>=>z=19,A=12
d.Helium <19K³9>=>z=19,A=39

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